diff --git a/actionmailer/CHANGELOG b/actionmailer/CHANGELOG
index f1ba5910ba14f..df13a43ca154b 100644
--- a/actionmailer/CHANGELOG
+++ b/actionmailer/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Increase mail delivery test coverage.  #8692 [kamal]
+
 * Register alternative template engines using ActionMailer::Base.register_template_extension('haml').  #7534 [cwd, Josh Peek]
 
 * Only load ActionController::UrlWriter if ActionController is present [Rick Olson]
diff --git a/actionmailer/test/mail_service_test.rb b/actionmailer/test/mail_service_test.rb
index 2532760b4a3fc..132a714cb12af 100755
--- a/actionmailer/test/mail_service_test.rb
+++ b/actionmailer/test/mail_service_test.rb
@@ -276,7 +276,7 @@ def new_mail( charset="utf-8" )
   def setup
     ActionMailer::Base.delivery_method = :test
     ActionMailer::Base.perform_deliveries = true
-    ActionMailer::Base.raise_delivery_errors
+    ActionMailer::Base.raise_delivery_errors = true
     ActionMailer::Base.deliveries = []
 
     @original_logger = TestMailer.logger
@@ -489,7 +489,16 @@ def test_doesnt_raise_errors_when_raise_delivery_errors_is_false
     TestMailer.any_instance.expects(:perform_delivery_test).raises(Exception)
     assert_nothing_raised { TestMailer.deliver_signed_up(@recipient) }
   end
-  
+
+  def test_performs_delivery_via_sendmail
+    sm = mock()
+    sm.expects(:print).with(anything)
+    sm.expects(:flush)
+    IO.expects(:popen).once.with('/usr/sbin/sendmail -i -t', 'w+').yields(sm)
+    ActionMailer::Base.delivery_method = :sendmail
+    TestMailer.deliver_signed_up(@recipient)
+  end
+
   def test_delivery_logs_sent_mail
     mail = TestMailer.create_signed_up(@recipient)
     logger = mock()
diff --git a/actionmailer/test/test_helper_test.rb b/actionmailer/test/test_helper_test.rb
index a22e7a5991503..08f92865caec6 100644
--- a/actionmailer/test/test_helper_test.rb
+++ b/actionmailer/test/test_helper_test.rb
@@ -38,6 +38,19 @@ def test_repeated_assert_emails_calls
     end
   end
   
+  def test_assert_emails_with_no_block
+    assert_nothing_raised do
+      TestHelperMailer.deliver_test
+      assert_emails 1
+    end
+    
+    assert_nothing_raised do
+      TestHelperMailer.deliver_test
+      TestHelperMailer.deliver_test
+      assert_emails 3
+    end
+  end
+  
   def test_assert_no_emails
     assert_nothing_raised do
       assert_no_emails do